Struct OneOrMany 

pub struct OneOrMany<T>(/* private fields */);

A value that may serialize as either a single T or as an ordered array of T.

On the wire an empty OneOrMany is emitted as an empty array, a single entry as a bare value, and multiple entries as a JSON array.

Examples

let one: OneOrMany<String> =
    serde_json::from_str(r#""Hello""#).unwrap();
assert_eq!(one.as_slice(), &["Hello".to_owned()]);

let many: OneOrMany<String> =
    serde_json::from_str(r#"["A", "B"]"#).unwrap();
assert_eq!(many.len(), 2);

Implementations

impl<T> OneOrMany<T>

pub const fn new() -> Self

Creates an empty OneOrMany.

pub fn one(value: T) -> Self

Creates a OneOrMany containing a single value.

pub const fn many(values: Vec<T>) -> Self

Creates a OneOrMany from a pre-existing Vec.

pub fn as_slice(&self) -> &[T]

Returns a slice view of the contained values.

pub fn as_mut_slice(&mut self) -> &mut [T]

Returns a mutable slice view of the contained values.

pub fn into_vec(self) -> Vec<T>

Returns the underlying Vec, consuming self.

pub fn push(&mut self, value: T)

Appends a value.

pub const fn is_empty(&self) -> bool

Returns true if empty.

pub const fn len(&self) -> usize

Returns the number of contained values.

pub fn iter(&self) -> Iter<'_, T>

Returns an iterator over the contained values.

pub fn iter_mut(&mut self) -> IterMut<'_, T>

Returns a mutable iterator over the contained values.

pub fn first(&self) -> Option<&T>

Returns a reference to the first value, if any.

pub fn last(&self) -> Option<&T>

Returns a reference to the last value, if any.

Trait Implementations

impl<T: Clone> Clone for OneOrMany<T>

fn clone(&self) -> OneOrMany<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for OneOrMany<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T> Default for OneOrMany<T>

fn default() -> Self

Returns the “default value” for a type.

impl<'de, T: Deserialize<'de>> Deserialize<'de> for OneOrMany<T>

fn deserialize<D: Deserializer<'de>>(deserializer: D) -> Result<Self, D::Error>

Deserialize this value from the given Serde deserializer.

impl<T: Eq> Eq for OneOrMany<T>

impl<T> From<T> for OneOrMany<T>

fn from(value: T) -> Self

Converts to this type from the input type.

impl<T> From<Vec<T>> for OneOrMany<T>

fn from(values: Vec<T>) -> Self

Converts to this type from the input type.

impl<T> FromIterator<T> for OneOrMany<T>

fn from_iter<I: IntoIterator<Item = T>>(iter: I) -> Self

Creates a value from an iterator.

impl<T: Hash> Hash for OneOrMany<T>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T> IntoIterator for OneOrMany<T>

type Item = T

The type of the elements being iterated over.

type IntoIter = IntoIter<T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a, T> IntoIterator for &'a OneOrMany<T>

type Item = &'a T

The type of the elements being iterated over.

type IntoIter = Iter<'a, T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<'a, T> IntoIterator for &'a mut OneOrMany<T>

type Item = &'a mut T

The type of the elements being iterated over.

type IntoIter = IterMut<'a, T>

Which kind of iterator are we turning this into?

fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value.

impl<T: PartialEq> PartialEq for OneOrMany<T>

fn eq(&self, other: &OneOrMany<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: Serialize> Serialize for OneOrMany<T>

fn serialize<S: Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error>

Serialize this value into the given Serde serializer.

impl<T: PartialEq> StructuralPartialEq for OneOrMany<T>